Data underlying the publication "Check-probe spectroscopy of lifetime-limited emitters in bulk-grown silicon carbide"

Solid-state single-photon emitters provide a versatile platform for exploring quantum technologies such as optically connected quantum networks. A key challenge is to ensure optical coherence and spectral stability of the emitters. Here, we introduce a high-bandwidth `check-probe' scheme to quantitatively measure (laser-induced) spectral diffusion and ionisation rates, as well as homogeneous linewidths. We demonstrate these methods on single V2 centers in commercially available bulk-grown 4H-silicon carbide. Despite observing significant spectral diffusion under laser illumination (≳GHz/s), the optical transitions are narrow (∼35 MHz), and remain stable in the dark (≳1 s). Through Landau-Zener-Stückelberg interferometry, we determine the optical coherence to be near-lifetime limited (T2 = 16.4(4) ns), hinting at the potential for using bulk-grown materials for developing quantum technologies. These results advance our understanding of spectral diffusion of quantum emitters in semiconductor materials, and may have applications for studying charge dynamics across other platforms.<br>This server contains the data and jupyter notebooks to reproduce the figures (see README file for instructions). Execute the notebook files (.ipynb extension) via an iPython environment. These will load the data from the .json data files to recreate the figures.

固态单光子发射器（solid-state single-photon emitters）为探索光连接量子网络等量子技术提供了通用研究平台。当前亟需解决的关键挑战在于保障发射器的光学相干性与光谱稳定性。本文提出一种高带宽校验探测（check-probe）方案，可定量测量激光诱导（laser-induced）的光谱扩散与电离速率，以及均匀线宽。我们在商用体生长4H碳化硅中的单个V₂中心上验证了该方法的有效性。尽管在激光辐照下观测到显著的光谱扩散（≳GHz/s），但光学跃迁线宽较窄（∼35 MHz），且在暗态下可保持稳定超过1秒（≳1 s）。通过朗道-齐纳-施特克尔贝格干涉术（Landau-Zener-Stückelberg interferometry），我们测得其光学相干性接近寿命极限（T₂ = 16.4(4) ns），这暗示体生长材料在量子技术开发中具备应用潜力。本研究加深了我们对半导体材料中量子发射器光谱扩散机制的理解，或可用于研究其他平台的电荷动力学。
本数据集包含用于复现实验图表的数据与Jupyter笔记本（详见README文件中的操作说明）。请在IPython环境中运行扩展名为.ipynb的笔记本文件，这些文件将从.json数据文件中加载数据以复现所有图表。